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Troubleshooting
312473B 13
Troubleshooting
Relieve pressure before servicing. See Typical
Installation, page 8.
Problem Cause Solution
Pump will not run, or stops. Air line valve shut off. Open valve.
Clogged fluid line or spray gun. Clear, service. Do not allow fluid to
setup in the pump and lines.
Stuck or damaged pump air valve. Service pump. Use filtered air.
Pump runs erratically. Clogged suction line or inlet strainer. Clear.
Pump runs too fast. Exhausted fluid supply. Refill fluid supply and prime sprayer.
Pump cycles at stall or fails to hold
pressure at stall.
Worn check valves or o-rings. Service pump.
Audible air leak. Worn air valve. Service pump.
Air bubbles in fluid. Loose suction line. Tighten. Use a compatible liquid
thread sealant or PTFE tape on con-
nections.
Ruptured diaphragm. Service pump.
Poor finish or irregular pattern. Incorrect fluid or air pressure at gun. See gun manual; read fluid manufac-
turer’s recommendations. Use fluid
regulator.
Fluid is too thick or too thin. Thin or thicken fluid; read fluid manu-
facturer’s recommendations.
Dirty, worn, or damaged spray gun. Service gun.
Fluid is settling out. Order Part No. 245081 Agitator Kit.